title: Hydrogen peroxide permeability of plasma membrane aquaporins of Arabidopsis thaliana.
abstract: Although aquaporins have been known to transport hydrogen peroxide (H(2)O(2)) across cell membranes, the H(2)O(2)-regulated expression patterns and the permeability of every family member of the plasma membrane intrinsic protein (PIP) toward H(2)O(2) have not been determined. This study investigates the H(2)O(2)-regulated expression levels of all plasma membrane aquaporins of Arabidopsis thaliana (AtPIPs), and determines the permeability of every AtPIP for H(2)O(2) in yeast. Hydrogen peroxide treatment of Arabidopsis down-regulated the expression of AtPIP2 subfamily in roots but not in leaves, whereas the expression of AtPIP1 subfamily was not affected by H(2)O(2) treatment. The growth and survival of yeast cells that expressed AtPIP2;2, AtPIP2;4, AtPIP2;5, or AtPIP2;7 was reduced in the presence of H(2)O(2), while the growth of yeast cells expressing any other AtPIP family member was not affected by H(2)O(2). These results show that only certain isoforms of AtPIPs whose expression is regulated by H(2)O(2) treatment are permeable for H(2)O(2) in yeast cells, and suggest that the integrated regulation of aquaporin expression by H(2)O(2) and the capacity of individual aquaporin to transport H(2)O(2) are important for plant response to H(2)O(2).
authors.affiliation: Department of Plant Biotechnology and Agricultural Plant Stress Research Center, College of Agriculture and Life Sciences, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 500-757, South Korea.
authors.forename: Cortwa
authors.initials: C
authors.lastname: Hooijmaijers
authors.forename: Ji Ye
authors.initials: JY
authors.lastname: Rhee
authors.forename: Kyung Jin
authors.initials: KJ
authors.lastname: Kwak
authors.forename: Gap Chae
authors.initials: GC
authors.lastname: Chung
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Horie
authors.forename: Maki
authors.initials: M
authors.lastname: Katsuhara
authors.forename: Hunseung
authors.initials: H
authors.lastname: Kang
mesh_terms: D020346:Aquaporins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000166:cytology* / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism*; D002463:Cell Membrane Permeability / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000378:metabolism* / Q000494:pharmacology; D050296:Microbial Viability / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics; D018517:Plant Roots / Q000187:drug effects / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D012835:Silver Nitrate / Q000494:pharmacology
chemical_list: D020346:Aquaporins; D029681:Arabidopsis Proteins; D012835:Silver Nitrate; D006861:Hydrogen Peroxide